Raging Rouge vs Orcish Dermis

How close are they?

ΔE 8.6, close: similar, with a visible difference side by side. Orcish Dermis is a little darker, cooler than Raging Rouge.

Can I use Orcish Dermis instead of Raging Rouge?

Usually, if you are not matching paint already on the model. Close match (ΔE 9). Orcish Dermis is a little darker, cooler than Raging Rouge.

Can I use Raging Rouge instead of Orcish Dermis?

The same difference applies the other way round: Raging Rouge is a little lighter, warmer.

ΔE is the colour difference between our two swatch estimates: under about 6 is close, over about 15 is loose. Real paints also differ in finish, coverage and how they thin, so test before you commit.